diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/bios/rammap.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/bios/rammap.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/rammap.c b/drivers/gpu/drm/nouveau/core/subdev/bios/rammap.c new file mode 100644 index 000000000000..916fa9d302b7 --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/bios/rammap.c @@ -0,0 +1,88 @@ +/* + * Copyright 2013 Red Hat Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Ben Skeggs + */ + +#include <subdev/bios.h> +#include <subdev/bios/bit.h> +#include <subdev/bios/rammap.h> + +u16 +nvbios_rammap_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, + u8 *cnt, u8 *len, u8 *snr, u8 *ssz) +{ + struct bit_entry bit_P; + u16 rammap = 0x0000; + + if (!bit_entry(bios, 'P', &bit_P)) { + if (bit_P.version == 2) + rammap = nv_ro16(bios, bit_P.offset + 4); + + if (rammap) { + *ver = nv_ro08(bios, rammap + 0); + switch (*ver) { + case 0x10: + case 0x11: + *hdr = nv_ro08(bios, rammap + 1); + *cnt = nv_ro08(bios, rammap + 5); + *len = nv_ro08(bios, rammap + 2); + *snr = nv_ro08(bios, rammap + 4); + *ssz = nv_ro08(bios, rammap + 3); + return rammap; + default: + break; + } + } + } + + return 0x0000; +} + +u16 +nvbios_rammap_entry(struct nouveau_bios *bios, int idx, + u8 *ver, u8 *hdr, u8 *cnt, u8 *len) +{ + u8 snr, ssz; + u16 rammap = nvbios_rammap_table(bios, ver, hdr, cnt, len, &snr, &ssz); + if (rammap && idx < *cnt) { + rammap = rammap + *hdr + (idx * (*len + (snr * ssz))); + *hdr = *len; + *cnt = snr; + *len = ssz; + return rammap; + } + return 0x0000; +} + +u16 +nvbios_rammap_match(struct nouveau_bios *bios, u16 khz, + u8 *ver, u8 *hdr, u8 *cnt, u8 *len) +{ + int idx = 0; + u32 data; + while ((data = nvbios_rammap_entry(bios, idx++, ver, hdr, cnt, len))) { + if (khz >= nv_ro16(bios, data + 0x00) && + khz <= nv_ro16(bios, data + 0x02)) + break; + } + return data; +} |